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The F-111 was an extremely advanced design using the "swing wing" or variable geometry airfoil. Powered by fuel-efficient turbofan engines, the aircraft went through a long and varied evolutionary process, emerging as perhaps the finest long-range interdictor of the 1980s. It served in many roles, flying thousands of combat sorties, and carried a vast array of weaponry, including nuclear payloads, missiles, and bombs. It could also pack a Vulcan cannon. Total stores amounted to 31,500 pounds for any one mission, plus fuel and crew.